Soft starters overcome torque problems
A
WEG Electric Motors product story
Edited by the Engineeringtalk editorial team
Sep 10, 2007
SSW-07 units overcome the sudden current inrush and high torque problems, which can result in wear and damage to mechanical power transmission equipment.
WEG's SSW-07 soft-starters are equipped with digital signal processors (DSPs), enabling them to provide exceptional performance for both starting and stopping of AC induction motors.
The SSW-07 units overcome the sudden current inrush and high-torque problems, which can result in wear and damage to mechanical power transmission equipment, and even to pipe work in pumping applications.
Easy to set-up and incorporating all motor protection functions, the SSW-07 soft starters provide an extremely simple, low-cost and compact solution to the problem of starting AC motors smoothly and efficiently without "snatch".
Designed with fully digital architectures, the SSW-07 soft starters use digital signal processors (DSPs) to accurately control the ramp voltage supplied to a motor over an optimum time period as set by the user.
This reduces stress on transmission devices, such as gearboxes, shafts and couplings, during motor start-up and helps to increase the life of both motor and mechanical parts as mechanical shocks are avoided.
The SSW-07 soft starters also provide high levels of system safeguarding in controlled stopping applications, especially where heavy dynamic loads are encountered.
In pumping applications, for example, an extended ramp down time can prevent damage to pipework systems resulting from the adverse effects of water hammer.
The soft starters are designed with a bypass function (on 17A to 30A models) that saves the user the cost of purchasing a separate contactor.
The bypass function also reduces installation costs, cabling and, by reducing the installation envelope of the soft starter, enclosure size.
The integrated bypass feature is complemented by a kick-start function for heavy loads and loads requiring high starting torque; a pump control function which avoids water hammer; integral electronic motor protection; electronic voltage monitoring; an electronic thermal relay; and electronic voltage monitoring.
The SSW-07 soft starters are designed to operate in environments up to 55C without current reduction.
They are suitable for universal voltages in the range 220 to 575V, and offer simple setting, installation and low maintenance.
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